The quickest and easiest way will be to sign up to a synchronisation service... something like Brick Freedom or Brick Packer. Note: these charge a commission on your sales.
Not sure if you already are or not, but you need to be set up as a seller on BL before you can use any synchronisation.
I can't comment on either of those services as I've never used them. I personally use BrickSync (which is free to use), but it doesn't take inventory from BrickOwl to BrickLink, only from BL to BO.
Comments
Note: these charge a commission on your sales.
https://brickfreedom.com/
https://www.brickpacker.com/
Not sure if you already are or not, but you need to be set up as a seller on BL before you can use any synchronisation.
I can't comment on either of those services as I've never used them. I personally use BrickSync (which is free to use), but it doesn't take inventory from BrickOwl to BrickLink, only from BL to BO.
https://github.com/ZZJHONS/Bricksync/releases